CN103322950B - Edge detection method based on ultrasonic wave - Google Patents
Edge detection method based on ultrasonic wave Download PDFInfo
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- CN103322950B CN103322950B CN201310249802.1A CN201310249802A CN103322950B CN 103322950 B CN103322950 B CN 103322950B CN 201310249802 A CN201310249802 A CN 201310249802A CN 103322950 B CN103322950 B CN 103322950B
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000003708 edge detection Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims description 45
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000010009 beating Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 14
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000033001 locomotion Effects 0.000 description 10
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- 210000003141 lower extremity Anatomy 0.000 description 2
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- 238000013481 data capture Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Abstract
The invention relates to an edge detection method based on ultrasonic waves, which comprises the following steps: step 11: placing a transducer above a device to be tested, and starting the transducer; step 12: moving the transducer in a plane; step 13: and recording the position of the transducer when the ultrasonic signal received by the transducer changes, and executing the step 12. The method utilizes the characteristic that the ultrasonic wave meets interface reflection, and obtains the edge position of the device by monitoring the change of the ultrasonic signal sent to the surface of the device by the transducer, thereby improving the accuracy of the detection of the edge position of the device, improving the detection efficiency and saving the manpower.
Description
Technical field
The invention belongs to fields of measurement, it is related to the edge detection method based on ultrasonic wave.
Background technology
It is thus necessary to determine that the size of device under test before device carries out nondestructive inspection test.In prior art, the chi of device
Very little being usually manually is estimated or is determined according to the basic document of device under test.But by way of artificial range estimation, can make
Become to produce very big error in actual mechanical process, specifically need to manipulate nondestructiving inspecting equipment through multiple repetition ability
Find the substantially edge of device although can find, but be reduction of the efficiency of detection, waste time and energy.And according to device under test
The size to determine device for the basic document, again can due in the case of losing in the stock of device it is still desirable to artificial
Range estimation carries out the mensure of device size.
Content of the invention
It is an object of the invention to provide a kind of edge detection method based on ultrasonic wave, in order to carry out nondestructive inspection in device
The size of device under test is accurately determined before test.
In order to reach foregoing invention purpose, the invention provides a kind of edge detection method based on ultrasonic wave, including：
Step 11：Transducer is placed in above device under test, starts described transducer；
Step 12：In one plane move described transducer；
Step 13：Record described transducer and receive the position being located when ultrasonic signal changes, execution step 12.
Preferred as technique scheme, methods described also includes：Step 14：Calculate the distance between two positions,
Obtain the size in the rectilinear direction corresponding to two positions.
Preferred as technique scheme, described transducer be located at described plane initial position for described device in institute
State within projection in plane.
Preferred as technique scheme, described transducer receives the position being located when ultrasonic signal changes
It is specially：Described transducer receives the ultrasonic signal generation position that step is located when beating from big to small.
Preferred as technique scheme, described move described transducer in the plane and include：
The size measuring described device first direction is：Move described transducer in the first direction or against first direction, when
When described transducer receives ultrasonic signal and changes, move backward described transducer, until described transducer receives
The ultrasonic signal marginal check that then completes on first direction when changing.
Preferred as technique scheme, when having pore structure in the middle of described device, the maximum of described pore structure is straight
Footpath is D, described move described transducer in the plane and includes：
The size measuring described device first direction is：Move described transducer in the first direction or against first direction, when
When described transducer receives ultrasonic signal and changes, continue to move to described transducer apart from L：
If the described ultrasonic signal that described transducer receives is initial level, continue to move to described transducer；
Step from big to small is occurred to beat compared with initial level if described transducer receives described ultrasonic signal,
Then record described transducer and receive position when ultrasonic signal changes, and move backward described transducer；
Wherein, described L>D.
Preferred as technique scheme, described device under test is horizontal positioned, and described transducer is placed in described to be measured
The top of device.
Preferred as technique scheme, it is provided with couplant, institute between described device under test and described transducer
State couplant and include deionized water or absolute alcohol.
Present invention also offers a kind of edge detecting device based on ultrasonic wave, including：Controller and transducer；
Described controller is connected with impulse sender, and described impulse sender is connected to the sending port of described transducer；
The receiving port of described transducer is connected with pulse receiver, and described pulse receiver is connected to data collecting card,
Described data collecting card is connected to described controller.
Preferred as technique scheme, described transducer is further fixed on mobile power unit, described mobile power list
The control end of unit is connected to described controller, for controlling described mobile power unit to drive described transducer to move.
Effect of the invention is that：
The edge detection method based on ultrasonic wave that the present invention provides, by transducer is placed in above device under test, and
In one plane move described transducer；Record described transducer and receive the position being located when ultrasonic signal changes
Put.The technical scheme that the present invention provides runs into the characteristic of interface reflection using ultrasonic wave, is sent to device by monitoring transducer
The ultrasonic signal change on surface carrys out the marginal position of acquisition device, the method increases the accuracy of device edge position detection
And improve the efficiency of detection, save manpower.
The edge detecting device based on ultrasonic wave that the present invention provides, is connected with impulse sender, pulse by controller
Transmitter is connected to the sending port of transducer；The receiving port of transducer is connected with pulse receiver, described pulse receiver
It is connected to data collecting card, described data collecting card is connected to described controller.The technical scheme that the present invention provides utilizes ultrasonic
Ripple runs into the characteristic of interface reflection, carrys out acquisition device by the ultrasonic signal change that monitoring transducer is sent to device surface
Marginal position, the method increases the accuracy of device edge position detection and improves the efficiency of detection, save manpower.
Brief description
By the description below in conjunction with the accompanying drawings its exemplary embodiment being carried out, the utility model features described above and advantage will
Can become more fully apparent with easy to understand.
A kind of schematic flow sheet of edge detection method based on ultrasonic wave that Fig. 1 provides for one embodiment of the invention.
Fig. 2 is the schematic diagram of a scenario of the rim detection in Fig. 1 based on ultrasonic wave.
Fig. 3 is the mobile route of transducer in Fig. 1.
A kind of structural representation of edge detecting device based on ultrasonic wave that Fig. 4 provides for further embodiment of this invention.
Wherein, 1- controller；2- transducer；3- impulse sender；4- pulse receiver；5- data collecting card；6- moves
Power unit.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Ultrasonic wave is the sound wave that frequency is more than 20Khz, because its wavelength is very short, straightline propagation the same with light wave.Super
In interface, some can be reflected sound wave, and some can be through this interface.In interface ultrasonic reflections with the relative intensity that passes through
It is to be determined by the acoustic impedance of interface both sides material.Ultrasonic wave has high-resolution, highly sensitive advantage, is visited using ultrasonic wave
Wound real-time detection can go out the size of fine defects, location and shape.Ultrasonic wave is usually used in nondestructive inspection test equipment (such as:Super
Ultra sonic scanner microscope), look for submarine and the shoal of fish, physical examination equipment, supersonic wave cleaning machine (15 ~ 50KHz), ultrasonic with sonar
Ripple humidifier, ultrasonic bonding (15 ~ 40KHz) etc..
A kind of schematic flow sheet of edge detection method based on ultrasonic wave that Fig. 1 provides for one embodiment of the invention, knot
Close shown in Fig. 1, present embodiments provide a kind of edge detection method based on ultrasonic wave, including：
Step 11：Transducer is placed in above device under test, starts transducer.The device under test that the present embodiment adapts to is permissible
Including：The device of smooth surface, the device of surface irregularity, but be totally in same level, or surface slightly tilts
Device.
This device under test can select horizontal direction to place it is also possible to select vertical direction fixed placement.If this device
Place for horizontal direction, then place a transducer at the top of this device, by faced by the receiving port of ultrasonic wave and sending port
This device.If this device is vertical direction fixed placement, before transducer placement and this device, by the receiving terminal of ultrasonic wave
Mouth and sending port are in the face of this device.No matter device under test selects which kind of modes of emplacement, ultrasonic transmission direction and device under test
The plane that is located of surface to be measured of device under test between for being vertically arranged.Preferably device under test is carried out water in the present embodiment
Square to placement, thus need not specific fixing device.
Step 12：In one plane move transducer.For the movement of transducer, can be by using motor, pneumatic
Or hydraulic means etc. to move it is also possible to move manually to control.During movement, transducer is constantly launched ultrasonic wave and is arrived
Reach device under test direction.Judged between the position that transducer and device surface are got along according to the acoustic signals that device surface returns
Relation, transducer is placed in above device under test, both can be in the surface range of device under test or to be measured
Outside the surface range of device.If in the case that transducer is placed in the surface range of device under test, transducer sends ultrasonic wave
Signal, to the surface of this device, can receive the ultrasonic signal of device front surface reflection, continues to move to surpass when transducer is mobile
Go out the surface of device, the ultrasonic reflections signal receiving can change, for example ultrasonic reflections blackout or connect
The ultrasonic reflections signal receiving weakens, and all in all, the waveform of the ultrasonic signal reflecting occurs the situation of step；
Similar with above-mentioned situation, if in the case that transducer is placed in outside the surface range of device under test, transducer sends ultrasonic wave
Outside the surface of device, when transducer moves to reach the surface of device, ultrasonic reflections signal step to signal can occur.Always
It, no matter which kind of metering system, in the marginal portion on device under test surface, the ultrasonic signal that transducer receives can become
Change.The whole edges finding device under test if necessary can move transducer by the move mode of such as progressive scan.
Step 13：Record transducer receives the position being located when ultrasonic signal changes.In the present embodiment, handle changes
The position that the ultrasonic signal of energy device reception device under test surface reflection changes is defined as the edge of device.Repeat above-mentioned step
Suddenly, the edge of all directions needed for device under test can be found.
Determine the edge of device by judging the reflection case on device under test surface for the ultrasonic wave, specially work as ultrasonic wave
Identical material is propagated, does not launch, when ultrasonic wave runs into layering it may occur that launching.
This method is the method at a kind of efficient, the intelligent autodetector part edge based on ultrasonic wave, convenient and swift.This
The edge detection method based on ultrasonic wave that embodiment provides is by being placed in transducer above device under test and flat at one
Mobile described transducer on face；Record described transducer and receive the position being located when ultrasonic signal changes.This enforcement
The technical scheme that example provides runs into the characteristic of interface reflection using ultrasonic wave, is sent to the super of device surface by monitoring transducer
Acoustic signals change carrys out the marginal position of acquisition device, the method increases the accuracy of device edge position detection and improves
The efficiency of detection, saves manpower.
Preferred as technique scheme, method also includes：Step 14：Calculate the distance between two positions, obtain
The size in rectilinear direction corresponding to two positions.After the edge position information getting device, ask for certain if necessary
The size of the device on individual direction just can be passed through the distance between this direction Shang Liangge position and obtain, and be specifically referred to
In plane right-angle coordinate, distance between two points asks for mode.Dimensional measurement due to only needing to device under normal circumstances is usual
Only need to the size of X, Y-direction, so the device size of this both direction can be carried out by the positional information at X, the edge of Y-direction
Ask for.
Preferred as technique scheme, the initial position that transducer is located at plane projects it in the plane for device
Interior.Within transducer projects in the plane positioned at device, then the moving range of transducer is confined to device and projects it in the plane
Interior, compared to the external margin of measurement device, the distance of relative movement little, save edge-detection time, and for measurement one
Size on individual direction moves backward after only needing to an edge is detected and can detect that another edge, so this two sides
As long as the size on the direction of edge place asks for the distance between two marginal positions can ask for.
Preferred as technique scheme, it is concrete that transducer receives the position being located when ultrasonic signal changes
For：Transducer receives the ultrasonic signal generation position that step is located when beating from big to small.When transducer is located at plane
Initial position for device project in the plane within when, transducer original state receive device under test surface reflection ultrasonic
Wave reflection signal, when the ultrasonic reflections signal that transducer in the planar range of removal device receives can produce step, so
It can be assumed that receiving, for transducer, the edge that ultrasonic signal occurs the position that step is located when beating from big to small to be device
Position.
Preferred as technique scheme, move transducer in the plane and include：
The size of measurement device first direction is：Move transducer, when transducer connects in the first direction or against first direction
When receiving ultrasonic signal and changing, move backward transducer, until the ultrasonic signal that transducer receives changes
Shi Ze completes the marginal check on first direction.Specific operating procedure is taking the description below as a example：Device under test is kept flat, will
Transducer moves to above device under test.Because ultrasonic wave can reflect in any layering interfaces, by judging device under test
The situation on surface is determining the edge of device.Mobile transducer, it is possible to use motor control is moving it is also possible to move manually.
During movement, constantly transmitting ultrasonic wave reaches device surface, judges to change according to the acoustic signals that device surface returns
Whether also above device surface, the position that device under test surface acoustic wave signal is disappeared is defined as the edge of device to energy device.Weight
Multiple above-mentioned steps, can find the edge of device under test all directions.According to two edges on same straight line it may be determined that device
Part size in this direction.
Preferred as technique scheme, it is provided with couplant between device under test and transducer, this couplant
Deionized water or absolute alcohol etc. can be included.Propagated in atmosphere due to ultrasonic wave and can there is layering or absciss layer, propagation condition
Poor, and be placed in water propagation and can accurately reflect when running into interface, it is easy to the accuracy of device edge detection.
The core content of the present embodiment is：Device under test is lain in couplant, moves transducer to above device,
Find the reflection sound wave of device surface.Transducer is moved by industrial computer controlled motor, is first moved to the left, real-time judge device table
The situation of face reflection sound wave, if surface reflected sonic signals are strong, continues to move to, and otherwise stops moving, and records transducer
Current location, is defined as the left side edge of device.Transducer is controlled to move right, the feelings of real-time judge device surface reflection sound wave
Condition the position of recording surface reflection sound wave disappearance, are defined as the right side edge of device.Right side edge position is deducted left side
Edge position, the as size of device horizontal direction.In the same manner, transducer is moved up and down, you can obtain in device vertical direction
Edge and size.
Fig. 2 is the schematic diagram of a scenario of the rim detection in Fig. 1 based on ultrasonic wave, and Fig. 3 is the mobile road of transducer in Fig. 1
Footpath, in conjunction with shown in Fig. 2 and Fig. 3, the edge detecting step that the present embodiment provides can be：
Step 101：Device is lain in couplant, transducer moves at the top p1 of device, when transducer exists
At p1 above device under test, ultrasonic wave reaches device surface by couplant, runs into unlike material, reflects, transducer
Receive reflected signal；
Step 102：First look for the edge of horizontal direction, transducer moves to p2 direction, in moving process, sentences in real time
Disconnected surface reflected sonic signals, if reflected signal is stronger, continue to move to same direction, if ultrasonic reflections signal is sent out
Raw step, then record the current location of transducer, as one marginal position p2；
Step 103：Look for another edge of horizontal direction, after finding an edge, control transducer counter motion, equally exist
When there is step in ultrasonic reflections signal, the current location of record transducer, it is another marginal position p3；
Step 104：Calculating device size in this direction, two marginal positions are subtracted each other, and that is, p3-p2 is device in this water
Size square upwards；
Step 105：In the same manner, move up transducer in the side perpendicular with above-mentioned horizontal direction, device can be found
Top edge and lower limb are it is possible to the size of the direction of calculating device.
Step 106：To calculate the size on remaining direction, device can be placed so that treating according to certain position
Survey consistent with the direction of motion of transducer or with transducer the direction of motion in direction perpendicular.
It will usually include the device that some have pore structure in the device carrying out nondestructive inspection using ultrasonic wave, these
Device due to including inward flange, so preferred as technique scheme, when there is pore structure in the middle of device, pore structure
Maximum gauge is D, moves transducer in the plane and includes：
The size of measurement device first direction is：Move transducer, when transducer connects in the first direction or against first direction
When receiving ultrasonic signal and changing, continue to move to transducer apart from L：
If the ultrasonic signal that transducer receives is initial level, continue to move to transducer；
Step from big to small is occurred to beat compared with initial level if transducer receives ultrasonic signal, record changes
Energy device receives position when ultrasonic signal changes, and moves backward transducer；
Wherein, L>D.
Pore structure on specific such as device under test is the through hole of a circle, and a diameter of 10cm of its maximum then continues
Mobile transducer can be, for example, the suitable scope such as 12cm, 15cm apart from L.
Centre is had to the device under test of pore structure, can arrange surface disappearance apart from tolerance, equally can determine and treat
Survey the positions and dimensions of device.Specifically, the middle device with hole is lain in couplant, this couplant can select
Select deionized water or absolute alcohol, specifically can be selected accordingly according to device under test, mobile transducer is in device
It is not the top of hole site, find the reflection sound wave of device surface, and arranged apart from tolerance L according to the diameter D of largest hole.Pass through
Industrial computer controlled motor moves transducer, is first moved to the left, the situation of real-time judge device surface reflection sound wave, if surface is anti-
Penetrate ultrasonic signal to change, continue to move to.Because this device has inner hole structure, for being should in place of preventing this signal intensity
Whether the edge of inner hole structure, need to continue to move to transducer apart from tolerance L, and judge the ultrasonic reflections signal receiving with just
There is step and beat in beginning signal, if there are then stopping moving, and record the position that the received ultrasonic signal of transducer changes
Put, be defined as the left side edge of device；If the ultrasonic reflections signal receiving behind the position of mobile L and initial signal phase
There is step than not to beat, then need to continue to move to transducer, find left side edge, in method and above-described embodiment, there is not hole
The device edge detection method of structure is identical, will not be described here.Edge method on the right side of detection device and detection left side edge
Method identical, referring to said process.Right side edge position is deducted left side edge position, the as chi of device horizontal direction
Very little.In the same manner, transducer is moved up and down, you can obtain the edge in device vertical direction and size.
The method comprises the following steps：
Step 201：To have pore structure device and lie in couplant, transducer will move to the upper of device no hole site
At square p1；
Step 202：First look for the edge of horizontal direction, transducer moves to p2 direction, in moving process, sentences in real time
Disconnected surface reflected sonic signals.If reflected signal is stronger, continue to move to same direction, if ultrasonic reflections signal is sent out
Raw step, continues to move to a segment distance, if the distance that surface disappears is more than the current location recording transducer apart from tolerance L,
It is a marginal position p2；If the distance that surface disappears is less than apart from tolerance L, i.e. device surface reflectance ultrasound ripple signal weight again
Newly reach initial level, then continue to move to, until the distance that surface disappears is more than till tolerance L, record working as of transducer
Front position, as one marginal position p2；
Step 203：Look for another edge of horizontal direction, after finding an edge, control transducer counter motion, equally super
When sound wave reflected signal occurs step to beat, continue to move to a segment distance, if the distance that surface disappears is more than apart from tolerance L,
The current location of record transducer, as one marginal position p3；If the distance that surface disappears is less than apart from tolerance L, i.e. device
Surface reflectance ultrasound ripple signal reaches initial level again, then continue to move to, until the distance that surface disappears is more than distance appearance
Till difference L, the current location of record transducer, it is another marginal position p3；
Step 204：Calculating device size in this direction, two marginal positions are subtracted each other, and that is, p3-p2 is device in the party
Size upwards；
Step 205：In the same manner, move up transducer in the side perpendicular with above-mentioned horizontal direction, device can be found
Top edge and lower limb are it is possible to the size of the vertical direction of calculating device；
Step 206：To calculate the size on remaining direction, device can be placed so that treating according to certain position
Survey consistent with the direction of motion of transducer or with transducer the direction of motion in direction perpendicular.
A kind of structural representation of edge detecting device based on ultrasonic wave that Fig. 4 provides for further embodiment of this invention,
In conjunction with shown in Fig. 4, it is somebody's turn to do the edge detecting device based on ultrasonic wave, including：Controller 1 and transducer 2；
Controller 1 is connected with impulse sender 3, and impulse sender 3 is connected to the sending port of transducer 2；
The receiving port of transducer 2 is connected with pulse receiver 4, and pulse receiver 4 is connected to data collecting card 5, data
Capture card 5 is connected to controller 1.Dotted arrow line in wherein Fig. 4 shows the direction of transfer of ultrasonic signal, runs into device table
Reflect during face.
If ultrasonic reflections signal is weaker, it is connected to pulse receiver 4 and transducer 2 using amplifier, and pulse
Between transmitter and transducer 2, carry out the amplification of ultrasonic signal, do not show in the accompanying drawings.
Preferred as technique scheme, transducer 2 is further fixed on mobile power unit 6, the control of mobile power unit 6
End processed is connected to controller 1, for controlling mobile power unit 6 to drive transducer 2 mobile.This mobile power unit can be electricity
Motivation, pneumatic, hydraulic power unit, to provide power for transducer.
The specific using method of the edge detecting device based on ultrasonic wave providing in the present embodiment and realization are to device
The method of rim detection refers to the introduction of the above-mentioned edge detection method based on ultrasonic wave, will not be described here.
The exhaustion of above-described embodiment not specific embodiment, also can have other embodiments, above-described embodiment purpose exists
In the explanation present invention, rather than limit the scope of the invention, all applications being come by simple change of the present invention all fall within this
In the protection domain of invention.
This patent specification goes to show the present invention using example, including optimal mode, and makes to be familiar with this area
Technical staff manufactures and uses the present invention.This invents delegatable scope and includes in the content and specification of claims
Specific embodiment and the content of other embodiments.These other examples also should belong to the scope of claims of the present invention,
As long as they contain the technical characteristic described by the identical written language of claim, or they include no real with claim
The technical characteristic described by similar literal language of matter difference.
All patents, the full content of patent application and other bibliography should be incorporated by reference into present specification.But
It is if one of the application term and the term phase conflict having included bibliography, preferential with the term of the application.
All scopes disclosed herein all include end points, and are to combine independently of one another between end points.
It should be noted that " first ", " second " or similar vocabulary are not offered as any order, quality or importance,
It is used only to distinguish different technical characteristics.The qualifier " about " that combined amount uses comprises described value and content context refers to
Fixed implication.（For example：It includes error during measurement specific quantity）.
Claims (6)
1. a kind of edge detection method based on ultrasonic wave is it is characterised in that include：
Step 11：Transducer is placed in above device under test, starts described transducer；
Step 12：In one plane move described transducer；
Step 13：Record described transducer and receive the position being located when ultrasonic signal changes, execution step 12；
Described transducer be located at described plane initial position project on the plane for described device within；
When having pore structure in the middle of described device, the maximum gauge of described pore structure is D, described move in the plane described in change
Can device include：
The size measuring described device first direction is：Move described transducer, when described in the first direction or against first direction
When transducer receives ultrasonic signal and changes, continue to move to described transducer apart from L：
If the described ultrasonic signal that described transducer receives is initial level, continue to move to described transducer；
Occur step from big to small to beat compared with initial level if described transducer receives described ultrasonic signal, remember
Record described transducer and receive position when ultrasonic signal changes, and move backward described transducer；
Wherein, described L>D.
2. the edge detection method based on ultrasonic wave according to claim 1 is it is characterised in that methods described also includes：
Step 14：Calculate the distance between two described positions, obtain the size in the rectilinear direction corresponding to two positions.
3. the edge detection method based on ultrasonic wave according to claim 1 is it is characterised in that described transducer receives
The position being located when ultrasonic signal changes is specially：Described transducer receives ultrasonic signal and rank from big to small occurs
The position that jump is located when beating.
4. the edge detection method based on ultrasonic wave according to claim 1 is it is characterised in that described move in the plane
Described transducer includes：
The size measuring described device first direction is：Move described transducer, when described in the first direction or against first direction
When transducer receives ultrasonic signal and changes, move backward described transducer, until described transducer receive super
The marginal check on first direction is then completed when acoustic signals change.
5. the edge detection method based on ultrasonic wave according to claim 1 is it is characterised in that described device under test is water
Placing flat, described transducer is placed in the top of described device under test.
6. the edge detection method based on ultrasonic wave according to claim 1 is it is characterised in that described device under test and institute
State and be provided with couplant between transducer, described couplant includes deionized water or absolute alcohol.
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| CN106247960A (en) * | 2016-07-21 | 2016-12-21 | 上海理工大学 | Utilize the method for bar diameter in THz wave or millimeter wave detection body of wall |
| CN110779476B (en) * | 2018-10-19 | 2022-01-11 | 深圳北芯生命科技股份有限公司 | Device and method for detecting straightness of medical catheter |
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| CN103119433A (en) * | 2010-09-15 | 2013-05-22 | 西门子奥钢联冶金技术有限公司 | Device for inspecting a moving metal strip |
| CN103018333A (en) * | 2012-12-07 | 2013-04-03 | 清华大学 | Synthetic aperture focused ultrasonic imaging method of layered object |
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| CN103322950A (en) | 2013-09-25 |
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